Cat litter enclosure



FIG. 1 is a perspective view taken from the top and front of a cat litter enclosure embodying my new design;

FIG. 2 is a perspective view taken from the bottom and rear thereof;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for "cat litter enclosure", as shown. 